S Muscae is a classical (δ) Cepheidvariable star in the constellationMusca about 2,600 light years away.
S Muscae is a yellow supergiant ranging between spectral types F6Ib and G0Ib and magnitudes 5.89 to 6.49 over a period of 9.66 days.[3] It is a luminous star around six times as massive as the Sun and 65.1 times the radius of the Sun. It is a binary star with a blue-white main sequence star companion likely to be of spectral type B3V to B5V with a mass of just over five solar masses,[11] one of the hottest and brightest companions of a Cepheid known. The two stars orbit each other every 505 days.[12]
S Muscae has been found to lie within the faint star cluster ASCC 69.[13]
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- Moskalik, P.; Gorynya, N. A. (2005). “Mean Angular Diameters and Angular Diameter Amplitudes of Bright Cepheids”. Acta Astronomica. 55: 247. arXiv:astro-ph/0507076. Bibcode:2005AcA….55..247M.
- Samus, N. N.; Durlevich, O. V.; et al. (2009). “VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)”. VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat….102025S. 1. Bibcode:2009yCat….102025S.
- Skiff, B. A. (2014). “VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2014)”. VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat….1.2023S.
- Ducati, J. R. (2002). “VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237….0D.
- Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). “SB9: The ninth catalogue of spectroscopic binary orbits”. Astronomy and Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A…424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
- Remage Evans, Nancy; Bond, Howard E.; Schaefer, Gail H.; Mason, Brian D.; Karovska, Margarita; Tingle, Evan (2013). “Binary Cepheids: Separations and Mass Ratios in 5 M ⊙ Binaries”. The Astronomical Journal. 146 (4): 93. arXiv:1307.7123. Bibcode:2013AJ….146…93E. doi:10.1088/0004-6256/146/4/93. S2CID 34133110.
- Petterson, O. K. L.; Cottrell, P. L.; Albrow, M. D. (2004). “The orbits of southern binary Cepheids”. Monthly Notices of the Royal Astronomical Society. 350 (1): 95–112. Bibcode:2004MNRAS.350…95P. doi:10.1111/j.1365-2966.2004.07555.x.
- Klagyivik, P.; Szabados, L. (2009). “Observational studies of Cepheid amplitudes. I. Period-amplitude relationships for Galactic Cepheids and interrelation of amplitudes”. Astronomy and Astrophysics. 504 (3): 959. arXiv:0908.3561. Bibcode:2009A&A…504..959K. doi:10.1051/0004-6361/200811464. S2CID 18283579.
- Evans, Nancy Remage; Massa, Derck; Fullerton, Alexander; Sonneborn, George; Iping, Rosina (2006). “Cepheid Masses: FUSE Observations of S Muscae”. The Astrophysical Journal. 647 (2): 1387–1392. arXiv:astro-ph/0607489. Bibcode:2006ApJ…647.1387E. doi:10.1086/505519. S2CID 119020617.
- Bohm‐Vitense, Erika; Remage Evans, Nancy; Carpenter, Kenneth; Beck‐Winchatz, Bernhard; et al. (1997). “The Mass of the Classical Cepheid S Muscae”. The Astrophysical Journal. 477 (2): 916. Bibcode:1997ApJ…477..916B. doi:10.1086/303725.
- Evans, Nancy Remage (1990). “The orbit and colors of the Cepheid S MUSCAE”. Publications of the Astronomical Society of the Pacific. 102: 551. Bibcode:1990PASP..102..551E. doi:10.1086/132668.
- Remage Evans, Nancy; Pillitteri, Ignazio; Wolk, Scott; Guinan, Edward; Engle, Scott; Bond, Howard E.; Schaefer, Gail H.; Karovska, Margarita; Depasquale, Joseph; Tingle, Evan (2014). “X-Ray Detection of the Cluster Containing the Cepheid S Mus”. The Astrophysical Journal Letters. 785 (2): L25. arXiv:1403.6939. Bibcode:2014ApJ…785L..25E. doi:10.1088/2041-8205/785/2/L25. S2CID 119113620.
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